双振子弯曲模态直线超声电机的结构设计

摘要

通过直线超声电机的结构形式和夹持方式的设计,改善电机的速度稳定性.提出了一款新型直线超声电机.该电机采用矩形板结构,它仅利用了矩形板结构的弯曲振动,有利于提高电机的输出效率;采用双振子结构,有利于提高电机双向速度一致性;单个振子采用一端铰支的夹持方式,有利于提高电机的结构稳定性和速度稳定性.探讨了定子的夹持形式对定子的运动自由度、结构稳定性和速度稳定性的影响规律,提出了有利于结构稳定、速度稳定的定子形式和加持方式;通过ANSYS仿真估算定子振动的对称和反对称模态频率,通过结构优化提高两相模态频率一致性.%This paper presents a method of improving the speed stability of the linear ultrasonic motor by changing the structure of the motor and the clamping style.First,a new type of linear ultrasonic motor is proposed.The motor adopts the rectangular slab structure,which just uses bending vibration to drive rotor.This structure enhances the output efficiency of the motor.The motor also adopts a double vibrator structure,which improves the speed consistency of the motor.Furthermore,the clamping method with one end hinged of each vibrator helps improve the structural stability and speed stability of the motor. Then,the effect of the clamping formed on the degree of freedom,structural stability and speed stability is discussed.Symmetric and anti-symmetric mode frequencies are estimated by ANSYS simulation.This two modal frequencies come into coincidence by means of structural optimization.